Large-screen display is becoming more and more widely used in life, and the technology for large-screen display has also been improved. At present, liquid crystal display is very optimistic with its excellent display effect, but the stitching technology in large-screen display has not yet reached The seamless level, while the small spacing of LEDs successfully compensated for this shortcoming and succeeded. In the mature stage of seamless LCD splicing technology, LED display jumped and occupied the big screen display market.
LED electronic display technology problem solving
The first is high luminous efficiency: the light effect of LED electronic display can be said to be an important indicator of energy saving effect. At present, China needs to strengthen the light effect effect. To achieve high light efficiency, it is necessary to solve related problems from all links of the industrial chain. Technical issues, then how to achieve high light efficiency? This article will specifically discuss the technical issues to be solved in several links such as extension, chip, package, and lamps.
1. Improve internal quantum efficiency and external quantum efficiency.
2. Improve package light extraction efficiency and lower junction temperature.
3. Improve the light extraction efficiency of the luminaire.
Secondly, from the perspective of high color rendering: LED electronic display light color quality, including color temperature, color rendering, light color fidelity, light color naturalness, hue recognition, visual comfort and so on. Here we are only discussing the issue of color temperature and color rendering. Producing a high color rendering LED display source will lose more light efficiency, so take care of these two factors when designing. Of course, to improve high color rendering, you must also consider the RGB three primary color combination to achieve. Here are my three methods:
1. Multi-primary phosphors.
2. RGB multi-chip combination.
3. Phosphor plus chip.
Again, from the perspective of high reliability: it mainly includes indicators such as failure rate and longevity. However, there are different understandings and explanations in the application. High reliability refers to the ability of a product to perform a specified function under specified conditions and within a specified time. The LED failure categories mainly have serious failures and parameter failures. Lifetime is a characterization of product reliability. Generally refers to the statistical average, for a large number of components, the life of the LED device is the meaning of this description. However, factors affecting the reliability of LED display products include chip manufacturing, packaging, thermal resistance, and heat dissipation. Since this is the case, I hope that enterprises will make two requirements on the basis of performing total quality control on LED display products:
1. Reduce failure rate.
2. Extend the loss of time.
Finally, in reducing the cost of products: At present, many consumers feel that the price is too high when they buy LED displays. Therefore, many LED display entrepreneurs have also taken corresponding measures to reduce costs in addition to mass production. , mainly methods and ways to take measures to reduce costs. Mainly in the epitaxial chip, packaging, drive, heat dissipation and other aspects to reduce costs, thereby fundamentally solving the cost of LED display products. Specifically speaking from the following four aspects:
1. The method of reducing costs in the epitaxial chip segment.
2. The method of reducing costs in the packaging process.
3. Ways to reduce costs in the lighting sector.
4. Other supporting costs are reduced.
How to control and improve the quality of LED full color display
The display effect of the full-color LED display is directly related to the user and the audience. To get a perfect experience, it is necessary to control and improve the quality of the LED display. So, how to control and improve the quality of LED full-color display? What is the important indicator of LED quality for full-color LED display?
LED devices are the most critical components of full-color LED displays for three reasons:
First of all, LED is the most used key component in the full-color screen, using thousands to tens of thousands of LEDs per square meter;
Secondly, LED is the main body that determines the optical display performance of the whole screen, which directly affects the audience's evaluation of the display screen;
Again, LEDs account for the largest share of the overall cost of the display, ranging from 30% to 70%. The choice of LED determines the quality of the entire display by more than 50%. If the LED is not selected, the other parts of the display will not be able to compensate for the defect in the quality of the display.
The main indicators reflecting the quality of LEDs for full-color LED displays are:
First, the failure rate
Since the full-color display is composed of tens of thousands or even hundreds of thousands of red, green and blue LED elements, the failure of any color LED will affect the overall visual effect of the display. Generally speaking, according to industry experience, the failure rate before the LED display starts to assemble to the aging 72 hours before shipment should be no more than three ten thousandth (refer to the failure caused by the LED device itself).
Second, antistatic ability
LEDs are semiconductor devices that are sensitive to static electricity and are highly susceptible to electrostatic failure. Therefore, antistatic capability is critical to the life of the display. In general, the LED's human body static mode test failure voltage should not be lower than 2000V.
Third, consistency
The full-color display is composed of countless red, green and blue LEDs. The brightness and wavelength consistency of each color LED determine the brightness consistency, white balance consistency and chroma of the entire display. consistency. In general, display manufacturers require device vendors to provide LEDs with a wavelength range of 5 nm and a brightness range of 1:1.3. These specifications can be achieved by device suppliers through a spectral color separation machine. The consistency of the voltage is generally not required.
Fourth, brightness
LED brightness is an important determinant of display brightness. The higher the brightness of the LED, the larger the margin of current used, which is beneficial for saving power and keeping the LED stable. LEDs have different angle values. In the case where the brightness of the chip is fixed, the smaller the angle, the brighter the LED, but the smaller the viewing angle of the display. Generally, a 100 degree LED should be selected to ensure a sufficient viewing angle of the display. For displays with different dot pitches and different line of sight, a balance should be found in brightness, angle and price.
Five, attenuation characteristics
The red, green, and blue LEDs all have the characteristic of attenuating the brightness as the working time increases. The advantages and disadvantages of the LED chip , the quality of the auxiliary materials and the level of the packaging process determine the attenuation speed of the LED. In general, after 1000 hours and 20 milliamperes of normal temperature lighting test, the attenuation of the red LED should be less than 10%, and the attenuation of the blue and green LEDs should be less than 15%. The consistency of red, green, and blue attenuation has a great influence on the white balance of the full-color LED display in the future, which in turn affects the display fidelity of the display.
Take a deep breath, close your eyes, the world has the freshest oxygen ... Yu Quan's "Deep Breath" is well known to us, but as the environmental problems become more and more serious, the haze sky also increases, PM2.5 PM10 and so on Vocabulary has also been mentioned more and more, and air purifiers have quickly become popular on the market with this "air quality" trend. Along with this, the air-clean brand has sprung up, and various technologies are dazzling. Which ones are indeed effective and which are just tasteless propaganda? How does the Air Purifier bother us to get rid of pollution? And look at the editors for you.
Analysis of air purifier
The critical value of PM2.5 content is 75 μg / m3
The pollutants in the air mainly include soot, total suspended particulates, inhalable particulates (PM2.5) and fine particulates (PM10). The smaller the diameter of the particulates, the deeper the part that can enter the respiratory tract. 10 micron diameter particles It is deposited in the upper respiratory tract, and particles below 2 microns can penetrate 100% into the bronchiole and alveoli.
1k-5k air purifier prices vary greatly
The air purifier products on the market not only have various functions, but also have prices ranging from thousand yuan to tens of thousands. The pricing of imported products is generally higher than that of domestic brands. Except for the core technology of many brands, the promotion of purification effects is similar, and consumers need to choose according to demand.
The air quality standard of 74 key cities is only 4.1%
According to the data of the press conference held by the State Council Information Office on June 4, according to the new "Ambient Air Quality Standards", the six pollutants SO2, NO2, PM10, PM2.5, CO and O3 were evaluated, 74 new standards In the first phase of monitoring and implementation, the proportion of cities that met the ambient air quality standards was only 4.1%, and the other 256 cities implemented the old air quality standards, and the proportion of cities that met the standards was 69.5%.
Air purifier sales increased by 90.5% compared with last year
According to a report recently released by the China Electronics and Information Industry Development Institute, due to the haze weather, air purifiers have become the most concerned home appliance products, with sales of nearly 2.4 million units nationwide last year, a year-on-year increase of 90.5%; retail The amount reached 5.6 billion yuan, a year-on-year increase of 105.9%.
HEPA filter needs to be replaced in March
The filter of the air purifier is the same as the filter of the water purifier, and it is not effective for a long time. After long-term use, the accumulation of dust on the surface of the filter will also cause the filter to gradually fail. Therefore, when the haze is more serious, the non-washable HEPA filter needs to be replaced every three months.
Merchants claim that the purification rate is more than 99% for the concept of stealing
99% or even 99.99% seems to have become a slogan for many air purifiers on the market. Many brands of products promote their high removal rate of PM2.5 and formaldehyde. In fact, this kind of publicity is more of a kind. The slogan of stealing the concept, the removal rate of 99% is the effect of the material itself on PM2.5 and formaldehyde, not the effect of actually running in space.
Home Ion Air Purifier
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Ningbo Zhe Kai Electric Appliance Co.,Ltd , https://www.cnairpurifiers.com
